Self-Knowledge

How do you know if you have attained self-knowledge?
pg.59 : Bhagavad Gita :  Eknath Eswaran

When a person has attained self-knowledge
they have banished all selfish desires
Their senses and mind are entirely trained
So that they are free from sensory cravings and self-will
Identified completely with the Self, not with Body or Mind
they realize their immortality on Earth